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        # 自我介绍
Good morning. I am glad to be here for this interview. My name is Zhang YunFeng, 22. I come from Xuancheng City, the southeast of Anhui Province. I major in Computer Science and Technology at BeiJing Wuzi University and will graduate here in this coming June. （介绍自己）
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        # Springboot 的优势

通过简化配置可以快速搭建 Spring 应用程序。
内嵌 servlet 容器，能够直接使用 java 的 main 方法启动，因此也不需要部署 war 包文件。
提供 starter 简化 Maven 配置。

# 有监督学习和无监督学习的区别
有监督：通过已有的训练样本（即已知数据及其对应的输出）去训练得到一个最优模型
无监督：由输入数据中学到或建立一个模型，并依此模式推测新的结果。输入数据没有被标记，也没有确定的结果。
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        # 基本概念
** 数据：** 数据是描述事物的符号记录，数据的含义称为数据的语义
** 数据库：** 长期存储、有组织、可共享的大量数据集合
** 数据库管理系统：** 和操作系统一样是计算机的基础软件
** 数据库系统：** 由数据库、数据库管理系统、数据库管理员组成
# 技术的发展阶段
人工管理 —— 文件系统 —— 数据库系统
# 数据模型
是对现实世界数据特征的抽象
![img](file:///C:/Users/admin/AppData/Local/Temp/msohtmlclip1/01/clip_image002.jpg)
最常用实体 - 联系方法，即 E-R...
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        使用范围 for 语句时，变量需定义在内部
for(auto c : line)
		c=toupper(c);

# 字符串转整数
string s=&amp;quot;123&amp;quot;;
stringstream ss;
int x=0;
ss&amp;lt;&amp;lt;s;
ss&amp;gt;&amp;gt;x;
cout&amp;lt;&amp;lt;x+1&amp;lt;&amp;lt;endl;

# 整数转字符串
int s=123;
stringstream ss;
string...
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        区块链交易原理
公有链、私有链、联盟链的区别
许可区块链与无许可区块链
Hyperledger Fabric 文档
# 什么是挖矿
传统商品的供应链，大家都比较熟悉，简单划分就是：生产 —— 交易 —— 使用。作为一般等价物的比特币，也存在着这 3 个环节：生产 —— 交易 —— 应用。了解了比特币的生产环节，也明白了什么叫做 “挖矿”。
区块链的本质，是一个分布式的公共账本，是一个记账系统，每一个参与的点，都可以在上边记账。虽然每一个参与的点都有记账的权利，但是这个账到底怎么一个计法？谁来记？怎么记？
比特币采用了一种叫做 PoW...
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        # 数组名取地址 &amp;amp; a
a 是一个数组名，对于一个普通的变量 b，&amp;amp;b 是指用取地址符号取得变量 b 的存放地址；a 在内存中没有分配空间，只对数组 a 的各个元素分配了存储空间，此处数组名字 a 显然不是普通的变量，&amp;amp;a 也不代表所取 a 的存储地址。
&amp;amp;a 在数值上等于 &amp;amp; a [0]，也等于 a。此时，&amp;amp;a 数值上等于整个数组的起始位置地址，含义上代表整个数组所占内存的大小，因为它的进阶单位是整个数组的字节长度，（&amp;amp;a + 1）等于的是数组结束之后的下一段的起始位置地址。
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        # anaconda 装完后，pip 无法使用的问题
系统的环境变量的 path 中，
D:Anaconda3
D:Anaconda3\Library\bin
D:Anaconda3\Scripts
均要添加
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        # 吃
牛街 西城区约 2 小时
王府井 东城区约 2 小时
前门大栅栏 西城区约 2 小时
南锣鼓巷 东城区约 2 小时
合生汇 朝阳区约两小时 20 分
# 逛街
三里屯太古里 朝阳区约 2 小时
朝阳大悦城 朝阳区约 2 小时 20 分
侨福芳草地 朝阳区约 2 小时
八达岭奥特莱斯 昌平区约 40 分钟
# 著名景点
故宫博物院 东城区约 2 小时 20-40 / 人 08:30 开园
颐和园 海淀区约 1 小时 40 分 10-20 / 人 06:30 开园
天安门 东城区约 2 小时 05:15-18:00 网上预约
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        新建 SketchUp 工程的时候，选择工程单位为 Meter (米)，如果不是米，则在 Tools -&amp;gt; Model Info -&amp;gt; Unit 内将 Format 修改为 Decimal : Meters 即可。因为会影响到 SketchUp 的原图，所以请注意如果精度不够的话还需要把 Precision 变更为足够的精度，把 Enable length snapping 也设置为和精度一致使其能够正确的执行自动捕捉。
导出时注意选择参数，请选择 File -&amp;gt; Export -&amp;gt; 3D Model 里面有 FBX 这个格式（好像只有...
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        sketchup——》unity3d 丢失模型贴图问题解决：打开 su 模型，文件→另存为→保存文件类型下拉另存为 8 版本
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